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3 years ago

6

A person sitting in a chair with wheels stands up, causing the chair to roll backward across the floor. How would you describe t

he momentum of the chair?

1 answer:

OleMash [197]3 years ago

3 0

Scenes the chair wheels are up the person is rolling backwards and if the wheels were down then the person would go forwards
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Plus and minus signs are used in one-dimensional motion to indicate direction. What is the sign of an acceleration that reduces

ladessa [460]

Answer:

Positive sign for negative velocity and minus sing for positive velocity

Explanation:

In the case of the negative velocity, the sign of the acceleration that reduces its magnitude is the positive sign, since being in the opposite direction to the movement indicates a deceleration or braking. In the case of the positive velocity, the sign of the acceleration that reduces its magnitude is the negative sign, since being in the opposite direction to the movement indicates a deceleration or braking. We observe that there will always be a reduction in the magnitude of the velocity if the acceleration goes in the opposite direction.

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3 years ago

A sample of water is heated at a constant pressure of one atmosphere. Initially, the sample is ice at 260 K, and at the end the

USPshnik [31]

In <u>370 K to 375 K </u>temperature intervals of 5 K, would be the greatest increase in the entropy of the sample.

Option: C

<u>Explanation</u>:

Because the largest difference in molar entropy occurs when a condensed phase (solid/liquid) transforms to the gas phase. Then change in entropy is equal to heat transfer divided by temperature: $\Delta \mathrm{S}=\frac{\Delta Q}{\mathrm{m} T}$ .

According to given ice sample at 260 K, when this solid sample start converting into liquid sample it will gain positive temperature and steam will take place near 373 K (273 K ice temperature + $100^{\circ} \mathrm{C}$ temperature of boiling water). Therefore it’s very obvious that greatest increase in entropy will occur during 370 K – 375 K.

5 0

3 years ago

Science Question

Daniel [21]

1 Is correct because James is going faster.
2 is correct because a faster speed on a position vs time graph will have a steeper slope
3 is correct as well.

The answer is 4 all of the above

8 0

3 years ago

Read 2 more answers

What are flavonoids responsible ?

Travka [436]

Answer:

<h3><em>Flavonoids</em><em> </em><em>are</em><em> </em><em>a </em><em>diverse</em><em> </em><em>group</em><em> of</em><em> </em><em>phytonutrients</em><em> </em><em>(</em><em>plant</em><em> </em><em>chemical</em><em>)</em><em> </em><em>found</em><em> in</em><em> </em><em>almost</em><em> </em><em>all</em><em> </em><em>fruits</em><em> and</em><em> </em><em>vegetables. </em><em>Along</em><em> with</em><em> </em><em>carotenoids</em><em> </em><em>they</em><em> </em><em>are</em><em> </em><em>Responsible</em><em> for</em><em> the</em><em> </em><em>vivid</em><em> </em><em>color</em><em> </em><em>in </em><em>fruit</em><em> </em><em>and</em><em> vegetables</em><em>.</em><em> </em><em>.</em><em>.</em><em>.</em><em>.</em><em> </em><em>Like</em><em> </em><em>other</em><em> </em><em>phytonutrients</em><em> </em><em>flavonoids</em><em> </em><em>are</em><em> </em><em>powerful</em><em> </em><em>antioxidant</em><em> </em><em>with</em><em> </em><em>anti-inflammatory</em><em> </em><em>and</em><em> </em><em>immune</em><em> </em><em>system</em><em> </em><em>benefits</em><em>.</em></h3>

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3 years ago

In water, sound travels 1500 m/s. A whale sings at a frequency of 17 Hz. What will be the length of the sound wave?

IgorLugansk [536]

Answer:

A 20 Hz sound wave is 75 m long in the water (1500/20 = 75) whereas a 20 Hz sound wave in air is only 17 m long (340/20 = 17) in air. As we descend below the surface of the sea, the speed of sound decreases with decreasing temperature.

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3 years ago